dlg.connect( "delete_event", G_CALLBACK( dialog_delete_callback ), &dialog );
GtkWidget *ok_button, *cancel_button;
g_object_get(G_OBJECT(dlg), "ok-button", &ok_button, "cancel-button", &cancel_button, nullptr);
dlg.connect( "delete_event", G_CALLBACK( dialog_delete_callback ), &dialog );
GtkWidget *ok_button, *cancel_button;
g_object_get(G_OBJECT(dlg), "ok-button", &ok_button, "cancel-button", &cancel_button, nullptr);